+
+#if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS)
+extern uschar *hosts_proxy; /* Hostlist which (require) use proxy protocol */
+extern uschar *proxy_external_address; /* IP of remote interface of proxy */
+extern int proxy_external_port; /* Port on remote interface of proxy */
+extern uschar *proxy_local_address; /* IP of local interface of proxy */
+extern int proxy_local_port; /* Port on local interface of proxy */
+extern BOOL proxy_session; /* TRUE if receiving mail from valid proxy */
+extern BOOL proxy_session_failed; /* TRUE if required proxy negotiation failed */
+#endif
+